>> If you’ve been looking for your Akismet API Key, let me see if I can help you out a little bit.
>> Go to WordPress.com and create a blog, or you can use your current WordPress.com blog, if you have one.
>> Login into your blog
>> After successfully logging in, open a new tab and browse to: http://apikey.wordpress.com/
>> The page will show your API Key along with your username.
>> You can use this API Key to activate Akismet Plugin in any other self-hosted WordPress blog.
Note: Don’t share your API key with others. Its like having a password to your site.